A fast charging pile remote monitoring system

Abstract

The utility model discloses a kind of fast charging pile remote monitoring systems, belong to charging pile remote monitoring technical field, solve the Hall sensor or sampling resistance due to temperature drift and sampling loop is interfered by internal high-power switch electromagnetic, superposition causes the small deviation of microcontroller current value to be difficult to identify, system misrecognizes deviation as real current change and error power regulation, make charging current deviate battery management system optimum value, prolong charging time and damage battery, also due to heat load calculation is not accurate to influence heat dissipation efficiency problem. Including precision voltage reference circuit, for generating stable positive and negative DC reference voltage. The utility model converts reference voltage into alternating signal by dynamic chopper, it is together with main road and redundant current sampling signal into differential integrator to carry out summation operation to amplify small DC deviation, and real-time monitoring integral output using window comparator, once overrun, then through logic latch locking state and drive photoelectric isolation to remote end and send alarm signal.

Description

Technical Field

[0001] This utility model relates to the field of remote monitoring technology for charging piles, and in particular to a remote monitoring system for fast charging piles. Background Technology

[0002] Charging stations are dedicated energy replenishment devices for new energy vehicles, and are divided into two categories: DC fast charging and AC slow charging. Their core components include charging circuits and control units, which can monitor charging and discharging parameters in real time, preventing risks such as overcurrent, overvoltage, and short circuits, and meeting safety standards. Widely deployed in commercial areas, residential communities, and highway service areas, they alleviate range anxiety and are key infrastructure for promoting the widespread adoption of new energy vehicles.

[0003] During the use of charging piles, the current sampling elements such as Hall sensors or sampling resistors may experience temperature drift and electromagnetic interference from internal high-power switches in the sampling circuit. This can lead to persistent, minute deviations in the current values ​​obtained by the microcontroller, which are difficult to identify. The system may mistakenly interpret these deviations as actual current changes and incorrectly adjust the power output, causing the actual charging current to deviate from the optimal setting of the battery management system. This can prolong charging time, damage the battery, and also affect heat dissipation efficiency due to inaccurate heat load calculations.

[0004] Therefore, a remote monitoring system for fast charging piles is proposed to solve or alleviate the above problems. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a remote monitoring system for fast charging piles.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A remote monitoring system for fast charging piles, including A precision voltage reference circuit is used to generate stable positive and negative DC reference voltages; The dynamic chopper circuit has its signal input terminal connected to the voltage signal output terminal of the precision voltage reference circuit, and is used to convert the positive and negative DC reference voltages into a high-frequency square wave chopper reference signal. The differential integral comparison circuit has a first signal input terminal connected to the main current sampling signal of the charging pile, a second signal input terminal connected to the redundant current sampling signal terminal, and a third signal input terminal connected to the chopper signal output terminal of the dynamic chopper circuit. It is used to sum and integrate the three received signals and compare them with a preset threshold to output a deviation detection signal. The logic processing circuit has its signal input terminal connected to the logic signal output terminal of the differential integral comparison circuit. It is used to perform logical OR operation and state latch on the deviation detection signal to output a stable alarm control signal. An isolated output circuit, whose control signal input terminal is connected to the control signal output terminal of a logic processing circuit, is used to electrically isolate and convert alarm control signals to output a remote alarm signal. The clock circuit, whose clock signal output terminal is connected to the clock control terminal of the dynamic chopper circuit, is used to provide the working clock for the dynamic chopper circuit.

[0007] Preferably, the precision voltage reference circuit includes a REF02EZ voltage reference source and a first OPA2180 dual operational amplifier. The voltage output terminal of the REF02EZ voltage reference source is connected to the non-inverting input terminal of the first operational amplifier in the first OPA2180 dual operational amplifier. The inverting input terminal of the first operational amplifier in the first OPA2180 dual operational amplifier is connected to its output terminal to form a voltage follower. The output terminal of the first operational amplifier in the first OPA2180 dual operational amplifier is connected to the inverting input terminal of the second operational amplifier in the first OPA2180 dual operational amplifier through a first resistor. The non-inverting input terminal of the second operational amplifier in the first OPA2180 dual operational amplifier is grounded. The output terminal of the second operational amplifier in the first OPA2180 dual operational amplifier is grounded through a second resistor. The output terminal of the second operational amplifier in the first OPA2180 dual operational amplifier is connected to its inverting input terminal to form an inverting unity-gain amplifier.

[0008] Preferably, the dynamic chopper circuit includes an ADG733 analog switch. The first channel signal input terminal of the ADG733 analog switch is connected to the positive reference voltage signal terminal provided by the precision voltage reference circuit. The second channel signal input terminal of the ADG733 analog switch is connected to the negative reference voltage signal terminal provided by the precision voltage reference circuit. The first common channel signal output terminal of the ADG733 analog switch is set as the chopper signal output terminal of the dynamic chopper circuit to output the chopper reference signal. The multiple channel control input terminals of the ADG733 analog switch are connected to the clock signal output terminal of the clock circuit.

[0009] Preferably, the differential-integral-comparison circuit includes a second OPA2180 dual operational amplifier. The inverting input of the second OPA2180 dual operational amplifier receives the main current sampling signal through a third resistor. The inverting input of the second OPA2180 dual operational amplifier receives the redundant current sampling signal through a fourth resistor. The inverting input of the second OPA2180 dual operational amplifier is connected to the chopper signal output of the dynamic chopper circuit through a fifth resistor. The non-inverting input of the second OPA2180 dual operational amplifier is grounded through a sixth resistor. The output of the second OPA2180 dual operational amplifier is connected to its inverting input through a feedback resistor. The output of the second OPA2180 dual operational amplifier is connected to its inverting input through a feedback capacitor.

[0010] Preferably, the logic processing circuit includes a TLV1702 window comparator, an SN74LVC1G32 OR gate, an RS latch, a lower threshold setting potentiometer, and an upper threshold setting potentiometer. The output of the second OPA2180 dual operational amplifier is connected to the inverting input of the first comparator and the non-inverting input of the second comparator in the TLV1702 window comparator. The non-inverting input of the first comparator in the TLV1702 window comparator is connected to the slider of the lower threshold setting potentiometer. The first fixed terminal of the lower threshold setting potentiometer is energized, and the second fixed terminal is grounded. The inverting input of the second comparator in the TLV1702 window comparator is connected to the slider of the upper threshold setting potentiometer. The first fixed terminal of the potentiometer is energized, the second fixed terminal of the upper limit threshold setting potentiometer is grounded, the output terminals of the first and second comparators in the TLV1702 window comparator are connected together as a logic signal output terminal, the first input terminal of the SN74LVC1G32 OR gate is connected to the output terminal of the first comparator in the TLV1702 window comparator, the second input terminal of the SN74LVC1G32 OR gate is connected to the output terminal of the second comparator in the TLV1702 window comparator, the output terminal of the SN74LVC1G32 OR gate is connected to the set terminal of the RS latch, the data input terminal of the RS latch is connected to a high level, and the data output terminal of the RS latch serves as the control signal output terminal of the logic processing circuit to output an alarm control signal.

[0011] Preferably, the isolated output circuit includes an optocoupler, wherein the anode of the light-emitting diode in the optocoupler is connected to the control signal output terminal of the logic processing circuit through a current-limiting resistor, the cathode of the light-emitting diode in the optocoupler is grounded, the collector of the phototransistor in the optocoupler serves as the remote alarm signal output terminal of the isolated output circuit to output a remote alarm signal, the collector of the phototransistor in the optocoupler is connected to power through a pull-up resistor, and the emitter of the phototransistor in the optocoupler is grounded.

[0012] Preferably, the clock circuit includes a CMOS timer ICM7555, the output of which outputs a square wave signal and is connected to the control input of the dynamic chopper unit.

[0013] This utility model has the following beneficial effects: This invention converts the reference voltage into an alternating signal through dynamic chopping, and sends it together with the main circuit and redundant current sampling signals into a differential integrator for summation to amplify small DC deviations. A window comparator is used to monitor the integral output in real time. Once the limit is exceeded, the state is locked through logic latch and an opto-isolation is driven to send an alarm signal to the remote end. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a structural block diagram of the present invention.

[0016] In the diagram: 1. Precision voltage reference circuit; 2. Dynamic chopper circuit; 3. Differential integral comparator circuit; 4. Logic processing circuit; 5. Isolated output circuit; 6. Clock circuit. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0019] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0020] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0022] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] A remote monitoring system for fast charging piles, such as Figure 1 As shown, the circuit includes a precision voltage reference circuit 1, a dynamic chopper circuit 2, a differential-integral comparator circuit 3, a logic processing circuit 4, an isolated output circuit 5, and a clock circuit 6. The precision voltage reference circuit 1 generates stable positive and negative DC reference voltages. The signal input terminal of the dynamic chopper circuit 2 is connected to the voltage signal output terminal of the precision voltage reference circuit 1, converting the positive and negative DC reference voltages into a high-frequency square wave chopper reference signal. The first signal input terminal of the differential-integral comparator circuit 3 is connected to the main current sampling signal of the charging pile, its second signal input terminal is connected to the redundant current sampling signal terminal, and its third signal input terminal is connected to the chopper signal of the dynamic chopper circuit 2. The output terminal of the circuit is connected to the summation and integration of the three received signals and compared with a preset threshold to output a deviation detection signal. The signal input terminal of the logic processing circuit 4 is connected to the logic signal output terminal of the differential integral comparison circuit 3 to perform logical OR operation and state latching on the deviation detection signal to output a stable alarm control signal. The control signal input terminal of the isolation output circuit 5 is connected to the control signal output terminal of the logic processing circuit 4 to perform electrical isolation conversion on the alarm control signal to output a remote alarm signal. The clock signal output terminal of the clock circuit 6 is connected to the clock control terminal of the dynamic chopper circuit 2 to provide a working clock for the dynamic chopper circuit 2.

[0024] The precision voltage reference circuit 1 includes a REF02EZ voltage reference source and a first OPA2180 dual operational amplifier. The voltage output terminal of the REF02EZ voltage reference source is connected to the non-inverting input terminal of the first operational amplifier in the first OPA2180 dual operational amplifier. The inverting input terminal of the first operational amplifier in the first OPA2180 dual operational amplifier is connected to its output terminal to form a voltage follower. The output terminal of the first operational amplifier in the first OPA2180 dual operational amplifier is connected to the inverting input terminal of the second operational amplifier in the first OPA2180 dual operational amplifier through a first resistor. The non-inverting input terminal of the second operational amplifier in the first OPA2180 dual operational amplifier is grounded. The output terminal of the second operational amplifier in the first OPA2180 dual operational amplifier is grounded through a second resistor. The output terminal of the second operational amplifier in the first OPA2180 dual operational amplifier is connected to its inverting input terminal to form an inverting unity-gain amplifier.

[0025] The dynamic chopper circuit 2 includes an ADG733 analog switch. The first channel signal input terminal of the ADG733 analog switch is connected to the positive reference voltage signal terminal provided by the precision voltage reference circuit 1. The second channel signal input terminal of the ADG733 analog switch is connected to the negative reference voltage signal terminal provided by the precision voltage reference circuit 1. The first common channel signal output terminal of the ADG733 analog switch is set as the chopper signal output terminal of the dynamic chopper circuit 2 to output the chopper reference signal. The multiple channel control input terminals of the ADG733 analog switch are connected to the clock signal output terminal of the clock circuit 6.

[0026] The differential-integral-comparison circuit 3 includes a second OPA2180 dual operational amplifier. The inverting input of the second OPA2180 dual operational amplifier receives the main current sampling signal through a third resistor. The inverting input of the second OPA2180 dual operational amplifier receives the redundant current sampling signal through a fourth resistor. The inverting input of the second OPA2180 dual operational amplifier is connected to the chopper signal output of the dynamic chopper circuit 2 through a fifth resistor. The non-inverting input of the second OPA2180 dual operational amplifier is grounded through a sixth resistor. The output of the second OPA2180 dual operational amplifier is connected to its inverting input through a feedback resistor. The output of the second OPA2180 dual operational amplifier is connected to its inverting input through a feedback capacitor.

[0027] Logic processing circuit 4 includes a TLV1702 window comparator, an SN74LVC1G32 OR gate, an RS latch, a lower threshold setting potentiometer, and an upper threshold setting potentiometer. The output of the second OPA2180 dual operational amplifier is connected to the inverting input of the first comparator and the non-inverting input of the second comparator in the TLV1702 window comparator. The non-inverting input of the first comparator in the TLV1702 window comparator is connected to the slider of the lower threshold setting potentiometer. The first fixed terminal of the lower threshold setting potentiometer is energized, and the second fixed terminal is grounded. The inverting input of the second comparator in the TLV1702 window comparator is connected to the slider of the upper threshold setting potentiometer. The first fixed terminal of the potentiometer is energized, the second fixed terminal of the upper limit threshold setting potentiometer is grounded, the output terminals of the first and second comparators in the TLV1702 window comparator are connected together as logic signal output terminals, the first input terminal of the SN74LVC1G32 OR gate is connected to the output terminal of the first comparator in the TLV1702 window comparator, the second input terminal of the SN74LVC1G32 OR gate is connected to the output terminal of the second comparator in the TLV1702 window comparator, the output terminal of the SN74LVC1G32 OR gate is connected to the set terminal of the RS latch, the data input terminal of the RS latch is connected to a high level, and the data output terminal of the RS latch serves as the control signal output terminal of the logic processing circuit 4 to output alarm control signals.

[0028] The isolation output circuit 5 includes an optocoupler. The anode of the light-emitting diode in the optocoupler is connected to the control signal output terminal of the logic processing circuit 4 through a current-limiting resistor. The cathode of the light-emitting diode in the optocoupler is grounded. The collector of the phototransistor in the optocoupler serves as the remote alarm signal output terminal of the isolation output circuit 5 to output a remote alarm signal. The collector of the phototransistor in the optocoupler is connected to power through a pull-up resistor. The emitter of the phototransistor in the optocoupler is grounded.

[0029] The clock circuit 6 includes a CMOS timer ICM7555. The output of the CMOS timer ICM7555 outputs a square wave signal and is connected to the control input of the dynamic chopper unit.

[0030] The operation of the remote monitoring system begins with the power-on startup of the precision voltage reference circuit 1. The REF02EZ voltage reference source inside the circuit first generates a highly stable positive 5V DC voltage. This voltage is sent to the voltage follower formed by the first operational amplifier in the first OPA2180 dual operational amplifier for buffering and enhancing the load-carrying capacity. At the same time, another path is sent through a resistor network to the inverting unity-gain amplifier formed by the second operational amplifier to generate a corresponding negative 5V DC voltage. Thus, the circuit obtains a precise reference with positive and negative symmetry.

[0031] Meanwhile, the CMOS timer ICM7555 begins self-oscillation to generate a square wave pulse signal of a fixed frequency and transmits it directly to the multiplexer input of the ADG733 analog switch. This drives the internal electronic switch to switch at high speed, causing the first and second channel signal inputs of the ADG733 analog switch to alternately conduct to their common output. This converts the received +5V and -5V DC reference voltages into a high-precision square wave chopper reference signal with zero volts as the symmetry center and alternating positive and negative amplitudes.

[0032] The chopped signal, along with the main current sampling signal acquired in real time from the main circuit of the charging pile and the redundant current sampling signal from the redundant Hall sensors in the charging pile, are synchronously sent to the differential integration comparison circuit 3. The summation and integration circuit composed of the second OPA2180 dual operational amplifiers superimposes the three signals through a matched input resistor network at the inverting input of the second OPA2180 dual operational amplifier. The common-mode noise in the main and redundant signals is effectively suppressed by the integrator because the amplitude and phase are highly consistent, while the small DC deviation signal representing the fault characteristics is modulated and desumed with the chopped reference square wave.

[0033] The integrator performs continuous integration in the time domain on the decomposed signal through the capacitor in its feedback network, accumulating and amplifying the microvolt-level DC deviation voltage into an integral output voltage with a significant slope. When there is no deviation in the main sampling channel, the integral output presents a sawtooth waveform symmetrical around zero volts. Once the main sensor experiences temperature drift, this waveform will drift unidirectionally, causing the center line of the sawtooth wave to continuously rise or fall.

[0034] The integrated output voltage is fed into the TLV1702 window comparator in real time and compared with the upper and lower threshold voltages preset by the potentiometer. Once the integrated voltage exceeds the safety window due to accumulated deviation, the corresponding TLV1702 window comparator output immediately flips from low level to high level to trigger an alarm.

[0035] The generated deviation detection signal is sent to logic processing circuit 4. First, the OR gate of SN74LVC1G32 performs an OR operation on the outputs of the two comparators to ensure that both the upper limit and lower limit faults are captured. Then, the output signal of the OR gate triggers the set terminal of the RS latch, locking its data output terminal to a high level. This alarm control signal will not reset even if the front-end deviation disappears briefly, thus avoiding alarm jitter.

[0036] Finally, the optocoupler starts to operate, and its light-emitting diode is driven to light up by the high level output of the RS latch. The internal phototransistor then conducts and transmits the alarm signal to the remote monitoring terminal without disturbance in an electrically isolated manner, thus completing the entire process from detecting a small deviation to outputting a stable remote alarm.

[0037] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A remote monitoring system for fast charging piles, characterized in that, include A precision voltage reference circuit (1) is used to generate stable positive and negative DC reference voltages; The dynamic chopper circuit (2) has its signal input terminal connected to the voltage signal output terminal of the precision voltage reference circuit (1) and is used to convert the positive and negative DC reference voltages into a high-frequency square wave chopper reference signal. The differential integral comparison circuit (3) has a first signal input terminal for connecting to the main current sampling signal of the charging pile, a second signal input terminal for connecting to the redundant current sampling signal terminal, and a third signal input terminal for connecting to the chopper signal output terminal of the dynamic chopper circuit (2). It is used to sum and integrate the three received signals and compare them with a preset threshold to output a deviation detection signal. The logic processing circuit (4) has its signal input terminal connected to the logic signal output terminal of the differential integral comparison circuit (3) and is used to perform logical OR operation and state latching on the deviation detection signal to output a stable alarm control signal. The isolation output circuit (5) has its control signal input terminal connected to the control signal output terminal of the logic processing circuit (4) and is used to electrically isolate and convert the alarm control signal to output a remote alarm signal. The clock circuit (6) has its clock signal output terminal connected to the clock control terminal of the dynamic chopper circuit (2) to provide a working clock for the dynamic chopper circuit (2).

2. The remote monitoring system for fast charging piles according to claim 1, characterized in that, The precision voltage reference circuit (1) includes a REF02EZ voltage reference source and a first OPA2180 dual operational amplifier. The voltage output terminal of the REF02EZ voltage reference source is connected to the non-inverting input terminal of the first operational amplifier in the first OPA2180 dual operational amplifier. The inverting input terminal of the first operational amplifier in the first OPA2180 dual operational amplifier is connected to its output terminal to form a voltage follower. The output terminal of the first operational amplifier in the first OPA2180 dual operational amplifier is connected to the inverting input terminal of the second operational amplifier in the first OPA2180 dual operational amplifier through a first resistor. The non-inverting input terminal of the second operational amplifier in the first OPA2180 dual operational amplifier is grounded. The output terminal of the second operational amplifier in the first OPA2180 dual operational amplifier is grounded through a second resistor. The output terminal of the second operational amplifier in the first OPA2180 dual operational amplifier is connected to its inverting input terminal to form an inverting unity-gain amplifier.

3. The remote monitoring system for fast charging piles according to claim 1, characterized in that, The dynamic chopper circuit (2) includes an ADG733 analog switch. The first channel signal input terminal of the ADG733 analog switch is connected to the positive reference voltage signal terminal provided by the precision voltage reference circuit (1). The second channel signal input terminal of the ADG733 analog switch is connected to the negative reference voltage signal terminal provided by the precision voltage reference circuit (1). The first common channel signal output terminal of the ADG733 analog switch is set as the chopper signal output terminal of the dynamic chopper circuit (2) to output the chopper reference signal. The multiple channel control input terminals of the ADG733 analog switch are connected to the clock signal output terminal of the clock circuit (6).

4. The remote monitoring system for fast charging piles according to claim 1, characterized in that, The differential-integral-comparison circuit (3) includes a second OPA2180 dual operational amplifier. The inverting input of the second OPA2180 dual operational amplifier receives the main current sampling signal through a third resistor. The inverting input of the second OPA2180 dual operational amplifier receives the redundant current sampling signal through a fourth resistor. The inverting input of the second OPA2180 dual operational amplifier is connected to the chopper signal output of the dynamic chopper circuit (2) through a fifth resistor. The non-inverting input of the second OPA2180 dual operational amplifier is grounded through a sixth resistor. The output of the second OPA2180 dual operational amplifier is connected to its inverting input through a feedback resistor. The output of the second OPA2180 dual operational amplifier is connected to its inverting input through a feedback capacitor.

5. The fast charging pile remote monitoring system according to claim 4, characterized in that, The logic processing circuit (4) includes a TLV1702 window comparator, an SN74LVC1G32 OR gate, an RS latch, a lower threshold setting potentiometer, and an upper threshold setting potentiometer. The output of the second OPA2180 dual operational amplifier is connected to the inverting input of the first comparator and the non-inverting input of the second comparator in the TLV1702 window comparator. The non-inverting input of the first comparator in the TLV1702 window comparator is connected to the sliding arm of the lower threshold setting potentiometer. The first fixed terminal of the lower threshold setting potentiometer is energized, and the second fixed terminal of the lower threshold setting potentiometer is grounded. The inverting input of the second comparator in the TLV1702 window comparator is connected to the sliding arm of the upper threshold setting potentiometer. The first fixed terminal of the device is energized, the second fixed terminal of the upper limit threshold setting potentiometer is grounded, the output terminals of the first comparator and the second comparator in the TLV1702 window comparator are connected together as the logic signal output terminal, the first input terminal of the SN74LVC1G32 OR gate is connected to the output terminal of the first comparator in the TLV1702 window comparator, the second input terminal of the SN74LVC1G32 OR gate is connected to the output terminal of the second comparator in the TLV1702 window comparator, the output terminal of the SN74LVC1G32 OR gate is connected to the set terminal of the RS latch, the data input terminal of the RS latch is connected to a high level, and the data output terminal of the RS latch is used as the control signal output terminal of the logic processing circuit (4) to output the alarm control signal.

6. The remote monitoring system for fast charging piles according to claim 1, characterized in that, The isolation output circuit (5) includes an optocoupler. The anode of the light-emitting diode in the optocoupler is connected to the control signal output terminal of the logic processing circuit (4) through a current-limiting resistor. The cathode of the light-emitting diode in the optocoupler is grounded. The collector of the phototransistor in the optocoupler serves as the remote alarm signal output terminal of the isolation output circuit (5) to output a remote alarm signal. The collector of the phototransistor in the optocoupler is connected to power through a pull-up resistor. The emitter of the phototransistor in the optocoupler is grounded.

7. The remote monitoring system for fast charging piles according to claim 1, characterized in that, The clock circuit (6) includes a CMOS timer ICM7555, the output of which outputs a square wave signal and is connected to the control input of the dynamic chopper unit.

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